TMS320VC5402ZGU100 参数 Datasheet PDF下载

TMS320VC5402

FIXED POINT DIGITAL SIGNAL PROCESSOR

SPRS079E – OCTOBER 1998 – REVISED AUGUST 2000

internal oscillator with external crystal

The internal oscillator is enabled by connecting a crystal across X1 and X2/CLKIN. The frequency of CLKOUT

is a multiple of the oscillator frequency. The multiply ratio is determined by the bit settings in the CLKMD register.

The crystal should be in fundamental-mode operation, and parallel resonant, with an effective series resistance

of 30

Ω

and power dissipation of 1 mW.

The connection of the required circuit, consisting of the crystal and two load capacitors, is shown in Figure 10.

The load capacitors, C

1

and C

2

, should be chosen such that the equation below is satisfied. C

L

in the equation

is the load specified for the crystal.

C

L

+

C

1

C

2

(

C

1

)

C

2

)

recommended operating conditions of internal oscillator with external crystal (see Figure 10)

MIN

fclock

Input clock frequency

10

MAX

20

UNIT

MHz

X1

Crystal

X2/CLKIN

C1

C2

Figure 10. Internal Oscillator With External Crystal

36

POST OFFICE BOX 1443

•

HOUSTON, TEXAS 77251–1443